Surveys on community response to road traffic noise were carried out at sites with and without belt of trees in Tomakomai and at sites with and without noise barriers in Kyushu. The total numbers of respondents and response rates are 268,92.4% in Tomakomai, and 387,79.5% in Kyushu, respectively.The distributions of respondents regarding demographic parameters are almost the same. However, the significant reductions of general annoyance and activity interference were shown at sites with belt of trees and noise barriers. Particularly, the differences in general annoyance, annoyance caused by exhaust and difficulty to open windows were larger.Path analysis was applied to the social response and noise data to investigate what factors strongly affect general annoyance. The effects of exhaust and vibration on general annoyance were larger at both sites with and without belt of trees. At sites without trees, sensitivity to noise and quality of sleep affected annoyance more and at sites with t
… Morerees, safety for road affected more. The effects of irritation and awakening were larger at both sites with and without noise barriers. At sites without noise barriers, sensitivity to noise and L_<eq> affect annoyance more and at sites with barriers TV/radio disturbance quality of sleep strongly affect annoyance.Such results suggest that safety for road and listening interference were relatively increased by visually concealing the noise sources with belt of trees and noise barriers and that not only reducing noise level but also the visual effect are important as noise measures.さらに、緑樹帯や防音塀の有無による騒音の不快感の反応構造をパス解析によって分析し、どのような要因が騒音の不快感へ影響しているかを検討した。緑樹帯の効果に関する調査ではその有無に関わらず、排気ガスと住宅の振動の効果が大きく、これまでの筆者らの一般道路での調査結果と一致している。緑樹帯のある側では道路の安全性の効果が大きく、緑樹帯が住民に安心感を与えていることを示唆しているが、緑樹帯のない側では普段の睡眠状態や騒音の敏感さ、L_<ep>の効果が大きかった。防音塀の効果に関する調査ではその有無に関わらず、覚醒、イライラの効果が大きく、高速道路では夜間に交通量が多いことに起因している。防音塀のある地区ではTV聴取妨害の効果が大きく、視覚的に音源が見えない分、相対的に聴覚的な効果が大きく現れたものと考えている。防音塀のない地区では騒音の敏感さ、L_<ep>の効果が大きく緑樹帯と同様の結果が得られた。このことは直接音源が見えることによって音源の物理特性を代表しているL_<ep>や音源に対する態度の効果が大きくなったものと考えられ、これらの遮蔽物の視覚的効果の重要性を示唆している。 Less